If it is a good watch, and I have no reason not to beleive you, it could be a duff battery. Wont be the first time this has happened.Hope so for your sake.Good luck.
Some watches (better ones) need to be reset by pulling out the crown either half or full way and then one of the buttons held till you see the clock face reset to 12pm. It might take a few tries with different combinations of watches with more than one button. Hope it helps......
I have a similar watch, on mine you have to make a contact between two electrodes inside the watch to reset it. The jewler knew how to do it and it was in the manual.